研究者情報 | 神奈川大学

ヒラノ　シンゴ Hirano Shingo 平野　信吾所属神奈川大学工学部応用物理学科職種助教
言語種別	英語
発行・発表の年月	2018/03
形態種別	学術雑誌
査読	査読あり
標題	Formation of the First Star Clusters and Massive Star Binaries by Fragmentation of Filamentary Primordial Gas Clouds
執筆形態	共著
掲載誌名	Astrophysical Journal
出版社・発行元	Institute of Physics Publishing
巻・号・頁	855(1),pp.17-26
担当区分	筆頭著者,責任著者
著者・共著者	◎Shingo Hirano,Naoki Yoshida,Yuya Sakurai,Michiko S. Fujii
概要	We perform a set of cosmological simulations of early structure formation incorporating baryonic streaming motions. We present a case where a significantly elongated gas cloud with ∼104 solar mass (M o) is formed in a pre-galactic (∼107 M o) dark halo. The gas streaming into the halo compresses and heats the massive filamentary cloud to a temperature of ∼10,000 Kelvin. The gas cloud cools rapidly by atomic hydrogen cooling, and then by molecular hydrogen cooling down to ∼400 Kelvin. The rapid decrease of the temperature and hence of the Jeans mass triggers fragmentation of the filament to yield multiple gas clumps with a few hundred solar masses. We estimate the mass of the primordial star formed in each fragment by adopting an analytic model based on a large set of radiation hydrodynamics simulations of protostellar evolution.
DOI	10.3847/1538-4357/aaaaba
ISSN	1538-4357
ORCIDのPut Code	42515034
PermalinkURL	http://orcid.org/0000-0002-4317-767X